(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.

 (3) On the overhead maintenance panel 50VU:

 (a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.

 (b) Put a warning notice to tell persons not to energize the FADEC 1(2).

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 Subtask 74-21-20-865-058

 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU ENGINE/1 AND 2/IGN/SYS A 1JH A03
 FOR 1000EM1 121VU ENGINE/IGN/ENG1/SYS B 3JH1 P41 121VU ENGINE/IGN/ENG1/SYS A BAT 2JH1 P39
 FOR 1000EM2 121VU ENGINE/IGN/ENG2/SYS B 3JH2 P42 121VU ENGINE/IGN/ENG2/SYS A BAT 2JH2 P40
 Subtask 74-21-20-010-056
 C. Open the fan cowl doors: (Ref. TASK 71-13-00-010-040)
 FOR 1000EM1
 437AL, 438AR
 FOR 1000EM2
 447AL, 448AR

 Subtask 74-21-20-040-053
 D. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041).
 Subtask 74-21-20-010-057
 E. Open the thrust reverser doors: (Ref. TASK 78-36-00-010-040)
 FOR 1000EM1
 451AL, 452AR
 FOR 1000EM2
 461AL, 462AR

 4. Procedure
_________
 (Ref. Fig. 601/TASK 74-21-20-991-302)
R Subtask 74-21-20-020-059
R A. Disconnect the left ignition lead connector (Ref. TASK 74-21-20-000-002).
R Subtask 74-21-20-100-051
R B. Clean the ceramic insulator and contact with lint free cloth is moist R with 1,1,1 trichorethane (Material No. CP1011) or Stoddart Solvent.
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 Inspection of the Left Ignition Lead
 Figure 601/TASK 74-21-20-991-302

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 C. Inspection of Left Ignition Lead:
 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
R R R  1. Type 3 and 4 exciter connector for : - Carbon tracks. 
- Thread damage. 
2. Type 3 igniter plug connector for: - Burned or pitted contact. 
- Cracked or chipped ceramic insulator. 
- Thread damage. 
3. Type 4 Igniter plug connector for:

Not serviceable.  Replace lead (Ref. TASK 74-21-20-000-002) and (Ref. TASK 74-21-20-400-002).
30 percent of lead-in thread or 10 percent on each of 2 lead-in threads may be missing after chasing. Chase threads or replacelead (Ref. TASK 74-21-20-000-002) and (Ref. TASK74-21-20-400-002)
Not serviceable.  Replace lead (Ref. TASK74-21-20-000-002) and (Ref. TASK 74-21-20-400-002).
Not serviceable.  Replace lead (Ref. TASK74-21-20-000-002) and (Ref. TASK 74-21-20-400-002).
30 percent of lead-in thread or 10 percent on each of 2 lead-in threads may be missing.  Chase threads or replacelead (Ref. TASK 74-21-20-000-002) and (Ref. TASK74-21-20-400-002).

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 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
R  CAUTION : DO NOT PULL_______ 
R  ON CONTACT 
R  AND CERAMIC 
R  INSULATOR 
R  TO INSPECT 
R  THE LEAD 
R  WIRE. THIS 
R  CAN CRACK 
R  THE 
R  SILICONE 
R  INSULATION 
R  OF THE WIRE 
R  CREATING AN 
R  ARC PATH TO 
R  THE 
R  INTERNAL 
R  SPRING 
R  RESULTING 
R  IN LEAD 
R  FAILURE. 
R  - Eroded or pitted  Not serviceable. 
R  contact. 
R  - Arcing or burning  Not serviceable. 
R  on contact or 
　
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